Material, storage container using the material, valve attached to the storage container, method of storing ClF and method of using ClF storage container

A storage container

• characterized in that the storage container is made of a material, the material is at least partly coated with a passive film of fluoride formed by contact with a gas containing ClF;
• characterized in that the storage container has an inner surface coated with the passive film;
• and
• characterized in that the storage container has a valve attached thereto, the valve having
• a flow passage for the gas to flow through,
• a valve seat through which the flow passage passes, and
• a valve member brought into contact with or away from the valve seat to close or open the flow passage, wherein
• the flow passage and the portions of the valve seat and valve member which are to be exposed to a gas are coated with the passive film.